Game Buzzer Circuit

Discussion in 'The Projects Forum' started by QuangVuong, Apr 2, 2011.

  1. QuangVuong

    QuangVuong Thread Starter New Member

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    Hi
    I'm kinda new to making circuits. I have a monostable 555 timer circuit which I need to integrate with another one. So if S1(PTM) is pressed thelight will stay on for about 5 seconds and the other switch cannot be used when the other switch is on. Vice versa.

    So I have drawn up a circuit in Yenka, and everything works. Except the light stays on forever. I tried increasing the resistance and lowering the capacitance but the light will not turn off after a few seconds. Would anyone have an idea? To turn the light off after a few seconds. If anyone wants to have a look at the circuit, I'll upload it.

    Its the bottom circuit.
     
    Last edited: Apr 2, 2011
    #1
  2. Wendy

    Wendy Moderator

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    Schematic please. Schematics tell much more than words.

    Have you thought of using the output of each 555 to feed the reset line of the others?
     
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  3. QuangVuong

    QuangVuong Thread Starter New Member

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    Uploaded first post.
     
    #3
  4. KMoffett

    KMoffett Senior Member

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    Never seen YENKA. Please post your image in a .png, .jpg, .gif, .pdf, or .doc file format so we can see it.

    Ken
     
    Last edited: Apr 2, 2011
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  5. Wendy

    Wendy Moderator

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    I was about to make the same comment. I haven't even heard of it, which is unusual. The best graphic format is .png, or .gif .
     
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  6. QuangVuong

    QuangVuong Thread Starter New Member

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    Yenka is a program which helps us draw up circuit diagrams and test them. It's a free program.

    Anyway, I'll take a screenshot and upload it here.
     
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  7. QuangVuong

    QuangVuong Thread Starter New Member

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    [​IMG]
     
    #7
  8. Wendy

    Wendy Moderator

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    Try this, it is what I suggested earlier...

    [​IMG]
     
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  9. QuangVuong

    QuangVuong Thread Starter New Member

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    Which inverter should I be using? 324op amp or 741 op amp?

    I need to use the basic monostable design to make a buzzer system, where a light turns on when one of the PTM switches are pressed. The light will turn off shortly. Anyone can press their switch, but only one light can stay on at a time. There will only be two switches.

    Im also thinking of using a thyristor, but then I need to find a way to connect the monostable circuit to a thyristor and then have two connected together. I can do it with a LED, but am having trouble with connecting the monostable circuit to the thyristor. Does anyone have an idea?

    Or how to just make a circuit which works like game shows on TV, but it has to use a monostable design?
     
    Last edited: Apr 2, 2011
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  10. Wendy

    Wendy Moderator

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    How about a CMOS (digital logic) inverter? You can also use 2 resistors and a transistor to make a single inverter (any general purpose NPN and two 10KΩ resistors).

    You didn't name inverters, you named op amps.

    Classic CMOS Hex inverters (6 in a package) would include a 4049, 4069, 40098, 40106. TTL is limited in voltage but examples would be the 7404, 7414.

    A good chip reference (there are many) is Sams Electronics Circuits (no relation to Sams).

    http://users.otenet.gr/~athsam/database.htm

    With any chip, be it digital or analog, ground the inputs to unused gates or op amps.
     
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  11. QuangVuong

    QuangVuong Thread Starter New Member

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    Yeah, I used a different method. I used 2 relays to spilt the circuits. When current passes through one, the relay will cut off the other one. Thanks for all your help
     
    #11
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